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Interaction of legionella pneumophila and helicobacter pylori with bacterial sp...

Background: It is well established that Legionella pneumophila is a waterborne pathogen; by contrast, the mode of Helicobacter pylori transmission remains unknown but water seems to play an important role. This work aims to study the influence of five microorganisms isolated from drinking water biofilms on the survival and integration of both of these pathogens into biofilms. Results: Firstly, both pathogens we...

Effect of chlorine on incorporation of Helicobacter pylori into drinking water ...

The use of a specific peptide nucleic acid (PNA) probe demonstrated that Helicobacter pylori persisted inside biofilms exposed to low concentrations of chlorine (0.2 and 1.2 mg liter–1) for at least 26 days, although no culturable cells were recovered. Coupled with data obtained using viability stains in pure culture, this result suggests that H. pylori can survive chlorination but remain undetectable by cult...

Community interactions promote Legionella pneumophila survival in drinking wate...

Legionella pneumophila is a waterborne pathogen that can cause Pontiac Fever or Legionnaires’ disease, a type of pneumonia that can be fatal. Although L. pneumophila is not able to replicate in low nutrient environments, such as drinking water, it is known that heterotrophic biofilms have a crucial role in the survival of this pathogen in drinking water distribution systems. The aim of this work is to study the...

Validation of SYTO 9/Propidium Iodide Uptake for rapid detection of viable but ...

Legionella pneumophila is an ubiquitous environmental microorganism that can cause Legionnaires’ disease or Pontiac fever. As a waterborne pathogen, it has been found to be resistant to chlorine disinfection and survive in drinking water systems, leading to potential outbreaks of waterborne disease. In this work, the effect of different concentrations of free chlorine was studied (0.2, 0.7, and 1.2 mg l−1), the...

Survival of drinking water pathogens to disinfection

Tese de Doutoramento em Engenharia Química e Biológica ; Legionella pneumophila is a waterborne pathogen, ubiquitous in natural aquatic environments. It is also commonly found in engineered waters when disinfection fails and is responsible for outbreaks and sporadic cases of Legionnaires’ disease worldwide. Conversely, the route of transmission of the gastric pathogen, Helicobacter pylori, is still unknown, bu...

Resistance of legionella pneumophila and helicobacter pylori to chlorination in...

The disintegration of concrete structures made of ordinary Portland cement (OPC) is a worrying topic of increasing significance. The development of new binders with longer durability is therefore needed. Alkali-activated binders have emerged as an alternative to OPC binders, which seems to have superior durability and environmental impact. This paper reviews current knowledge about alkali-activated binders. The...

Persistence of helicobacter pylori in heterotrophic drinking-water biofilms

Although the route of transmission of Helicobacter pylori remains unknown, drinking water has been considered a possible transmission vector. It has been shown previously that, in water, biofilms are a protective niche for several pathogens, protecting them from stressful conditions, such as low carbon concentration, shear stress, and less-than-optimal temperatures. In this work, the influence of these three pa...

Influence of carbon concentration, shear stress and temperature on survival of ...

Relevance of heterotrophic biofilms on the agglomeration of Helicobacter pylori...

The role of water and water-associated biofilms on the transmission of Helicobacter pylori has been under debate for the last 10 years. We have previously shown that the ability of this bacterium to form monospecies biofilms when exposed to water is quite limited. However, molecular detection methods have been used to demonstrate that H. pylori is present in water microenvironments. Here, we have tested the cul...

Influence of physico-chemical parameters on the survival of Helicobacter pylori...

The route of transmission for Helicobacter pylori is not well-known, but one of the suggested possibilities is via drinking water and associated biofilms. As such, the aim of this work is to study the influence of several physico-chemical parameters, including temperature, shear-stress and carbon concentration, on the prevalence and survival of H. pylori in drinking water biofilms. The biofilm studies were carr...